A method for field replacement test of a reflector surface and ring beam connecting device

Abstract

The application discloses a kind of field replacement test methods of reflecting surface and ring beam connecting device, belong to the technical field of maintenance of large-span spherical reflecting surface, solve the technical problem of interference damage of quadrilateral reflecting surface unit 2# end shaft and hoop gantry.It is as follows: two quadrilateral reflecting surface units in symmetrical position are selected as test objects, and the theoretical width and the theoretical height of the gantry of the test objects are determined by simulation and simulation; the original hoop is transformed into a new hoop according to the theoretical width and the theoretical height; the 2# end shaft track points are recorded; if the track points are within the specified range and no interference occurs, the theoretical width and the theoretical height meet the requirements, and the new hoop is used to replace the original hoop one by one.The hoop transformed according to the test results does not interfere with the 2# end shaft, and the two test units operate normally, and under the premise of meeting the normal use, the size and weight of the hoop can be reduced, thereby improving the convenience and cost of installation.

Description

Technical Field

[0001] This invention relates to the field of maintenance technology for large-span spherical reflectors, and more specifically, to a field replacement test method for the connection device between the reflector and the ring beam. Background Technology

[0002] The FAST active reflector consists of 4295 triangular reflector units, 150 quadrilateral reflector units, 6670 main cables, 2225 node panels, 2225 pull cables, and related auxiliary facilities. The quadrilateral reflector units are located at the edge of the cable net, such as... Figure 1 As shown, the quadrilateral reflector unit 2 is connected to the lower chord of the outer ring beam 1; the quadrilateral reflector unit 2 is a quadrilateral structure, with a total of 150 units of 30 different types. The two #2 end shafts of the quadrilateral reflector unit 2 are placed on the original clamp 3 of the circumferential steel pipe of the lower chord of the ring beam 1, and the other #0 and #1 end shafts of the quadrilateral unit are connected to the upper plate of the cable net node, respectively.

[0003] During telescope operation, there is relative motion between the cable net node disks, and the #1 and #2 connecting axis of the reflecting surface unit can adaptively slide. Currently, the #2 end axis of the quadrilateral unit interferes with the gantry 4 of the original clamp 3, such as... Figure 2 As shown, the height and width of the gantry 4 are insufficient. Currently, the No. 2 end shaft 5 of some quadrilateral units 1 has been damaged. The No. 2 end shaft 5 cannot effectively contact the stainless steel plate 6 of the original clamp 3, which affects the observation accuracy and working stability of FAST. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a field replacement test method for the connection device between the reflector and the ring beam, which can be used to design and modify the existing clamp gantry structure so that the #2 end shaft will not interfere with the gantry, thus ensuring the telescope's observation accuracy and operational stability.

[0005] The technical solution of this invention is: a field replacement test method for the connection device between the reflector and the ring beam, comprising the following steps:

[0006] Step 1. Select two quadrilateral reflective surface units that are relatively severely damaged and symmetrically positioned as test objects;

[0007] Step 2. Simulate the working conditions of multiple large zenith angle parabolic surfaces, calculate the axial displacement of end #2 of all quadrilateral reflective surface units in the sector where the test object is located under different parabolic surfaces, and preliminarily determine the theoretical width and theoretical height of the gantry of the test object;

[0008] Step 3. A portal structure is made according to the theoretical width and the theoretical height, a new hoop is obtained by modifying the original hoop, and the original hoop of the test object is replaced by the new hoop;

[0009] Step 4. The 2# end shaft movement track points of the test object are recorded in a test period, and a test point map is made; at the same time, the interference between the 2# end shaft of the test object and the new hoop is recorded;

[0010] Step 5. If the maximum displacement of the test point map is within the simulation maximum displacement range of the sector where the test object is located, and no interference occurs, the theoretical width and the theoretical height meet the requirements, and step 6 is performed; otherwise, the theoretical width and the theoretical height are corrected according to the maximum displacement and the interference of the test point map, and step 3 is performed;

[0011] Step 6. A quadrilateral reflective surface unit is randomly selected as a test object;

[0012] Step 7. The original hoop of the test object is replaced by the new hoop;

[0013] Step 8. The 2# end shaft movement track points of the test object are recorded in a test period, and a test point map is made; at the same time, the interference between the 2# end shaft of the test object and the new hoop is recorded;

[0014] Step 9. If the maximum displacement of the test point map is within the simulation maximum displacement range of the sector where the test object is located, and no interference occurs, the theoretical width and the theoretical height are respectively taken as the product width and the product height, and step 10 is performed; otherwise, the theoretical width and the theoretical height are corrected according to the maximum displacement and the interference of the test point map, and a new hoop is re-made, and step 7 is performed;

[0015] Step 10. A new hoop is made according to the product width and the product height, and the original hoop is replaced by the new hoop one by one.

[0016] As a further improvement, the 2# end shaft displacement includes displacement in the plane in the portal width direction, the vertical portal direction and the end shaft direction.

[0017] Further, the new hoop includes a hoop body, an expansion steel plate is provided on the top of the tray steel plate of the hoop body, the width of the expansion steel plate is greater than the width of the tray steel plate, a stainless steel plate is provided on the top of the expansion steel plate, a portal structure is provided on the top of the stainless steel plate, the width of the expansion steel plate is 400mm, the height is 300mm, the width of the portal structure is 350mm, and the height of the portal structure is 260mm.

[0018] Further, the portal frame structure comprises support rods of L-shaped structure on both sides of the stainless steel plate, upper ends of the support rods on both sides are connected with a horizontal rod, both ends of the horizontal rod are respectively provided with vertical rods, and observation mirrors are connected between the vertical rods on both ends, the width between the support rods on both sides is 350mm, and the height of the horizontal rod is 260mm.

[0019] Further, the tray steel plate is welded with an expansion steel plate, the lower end of the support rod is provided with a first threaded section, the first threaded section sequentially penetrates the stainless steel plate and the expansion steel plate downwards and is locked by double nuts, the first threaded section below the double nuts is provided with a split pin, the upper end of the support rod is provided with a second threaded section, both ends of the horizontal rod are respectively provided with threaded holes matched with the second threaded section, the second threaded section is provided with a jam nut, the vertical rod is provided with a first nut, both sides of the observation mirror are respectively provided with a second nut, the first nut and the second nut are connected by a first bolt, and the stainless steel plate and the expansion steel plate are connected by a second bolt.

[0020] Further, the surface of the stainless steel plate is provided with a Cartesian coordinate scale line, and the origin of the Cartesian coordinate scale line is located at the center of the stainless steel plate.

[0021] Further, the test period is 4 months, and the inspection period is 2-4 months.

[0022] Further, when the original hoop is replaced by the new hoop, the water stains and oil stains on the hoop installation position of the ring beam pipe wall are wiped clean.

[0023] Further, when the original hoop is replaced by the new hoop, the position and angle of the new hoop on the ring beam lower chord pipe are adjusted according to the back frame position of the quadrilateral reflective surface unit, so that the two 2# end shafts are respectively located at the center of the new hoop when the reflective surface is at the reference spherical surface.

[0024] Further, the observation mirror of the new hoop is adjusted to a suitable inclination angle, so that the maintenance personnel on the ring beam horse path can observe the overall situation of the movement of the 2# end shaft.

[0025] Beneficial effects

[0026] Compared with the prior art, the present application has the advantages that:

[0027] 1. The improved hoop according to the test results of the present application does not interfere with the 2# end shaft, and the two test quadrilateral reflective surface units operate normally.

[0028] 2. The improved size of the hoop is determined according to the comparison between the simulation value and the test value, the size and weight of the hoop can be reduced under the premise of meeting the normal use, so as to improve the installation convenience and cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a plan view of the FAST reflector unit;

[0030] Figure 2 is a schematic view of the interference between the 2# connecting mechanism of the quadrilateral unit and the original hoop portal frame;

[0031] Figure 3 is a flow chart of the present application;

[0032] Figure 4 is a schematic view of the structure of the first embodiment of the new hoop portal frame in the present application;

[0033] Figure 5 is a schematic view of the structure of the second embodiment of the new hoop portal frame in the present application;

[0034] Figure 6 is a schematic view of the front view structure of the second embodiment of the new hoop portal frame in the present application;

[0035] Figure 7 is a schematic view of the left view structure of the second embodiment of the new hoop portal frame in the present application;

[0036] Figure 8 is a schematic view of the structure of the support rod of the second embodiment of the portal frame in the present application;

[0037] Figure 9 is a schematic view of the front view structure of the cross rod and the vertical rod of the second embodiment of the portal frame in the present application;

[0038] Figure 10 is a schematic view of the left view structure of the cross rod and the vertical rod of the second embodiment of the portal frame in the present application;

[0039] Figure 11 is a schematic view of the structure of the observation mirror of the second embodiment of the portal frame in the present application.

[0040] Figure 12 is a test point map in the present application.

[0041] Wherein: 1 - ring beam, 2 - quadrilateral reflector unit, 3 - original hoop, 4 - portal frame, 5 - 2# end shaft, 6 - stainless steel plate, 7 - new hoop, 8 - hoop body, 9 - tray steel plate, 10 - expansion steel plate, 11 - stainless steel plate, 12 - support rod, 13 - cross rod, 14 - vertical rod, 15 - observation mirror, 16 - first threaded section, 17 - double nut, 18 - split pin, 19 - second threaded section, 20 - threaded hole, 21 - jam nut, 22 - first nut, 23 - second nut, 24 - first bolt, 25 - second bolt, 26 - portal frame structure, 27 - rectangular coordinate system scale line. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0043] See Figures 1-12 A field replacement test method for a reflector-beam connection device includes the following steps 1 to 10:

[0044] Step 1. Select two quadrilateral reflective surface units 2 that are relatively severely damaged and symmetrically positioned as test objects. For example... Figure 1 As shown, quadrilateral reflective surface units RA880 and RE888, which were relatively severely damaged and located symmetrically, were selected as the test objects. "Relatively severely damaged" means that among the damaged quadrilateral reflective surface units, the damage was the most severe or relatively severe.

[0045] Step 2. Simulate the working conditions of multiple large zenith-angle parabolic surfaces. Calculate the displacement of end shaft 5 (#2) of all quadrilateral reflector units 2 in the sector where the test object is located under different parabolic surfaces (only parabolic surfaces can realize FAST signal reflection to the feed cabin). Preliminarily determine the theoretical width and theoretical height of the gantry 4 of the test object. In this embodiment, simulate the working conditions of 96 large zenith-angle parabolic surfaces. Calculate the displacement of end shaft 5 (#2) of 30 quadrilateral reflector units 2 in the sector where the test object is located under different parabolic surfaces. The displacement of end shaft 5 (#2) includes displacement in three directions: in-plane gantry width direction, perpendicular to the gantry direction, and tilting direction.

[0046] Step 3. Construct the gantry structure 26 according to the theoretical width and theoretical height. Modify the original clamp 3 by constructing the gantry structure 26 to obtain the new clamp 7, such as... Figure 4 As shown, the original clamp 3 of the test object was then replaced with a new clamp 7, and the telescope was put into normal observation.

[0047] Step 4. Record the movement trajectory points of the #2 end shaft 5 of the test object during the test cycle, and create a test point location map, such as... Figure 11 As shown. Simultaneously, the interference between the #2 end shaft 5 of the test object and the new clamp 7 was recorded. In this embodiment, the test period was 4 months.

[0048] Step 5. If the maximum displacement of the test point map is within the simulation maximum displacement range of the sector where the test object is located, as shown in Table 1, and no interference occurs, then the theoretical width and theoretical height meet the requirements, and proceed to Step 6; otherwise, adjust the theoretical width and theoretical height according to the maximum displacement and interference of the test point map, and proceed to Step 3.

[0049] Table 1

[0050]

[0051] Step 6. Randomly select one quadrilateral reflecting surface unit 2 as the test object, which can be damaged or undamaged.

[0052] Step 7. Replace the original hoop 3 of the test object with a new hoop 7, and the telescope performs normal observation work.

[0053] Step 8. Record the active track points of the 2# end shaft 5 of the test object in the test period and make a test point map; at the same time, record the interference between the 2# end shaft 5 and the new hoop 7. In this embodiment, the test period is 2-4 months.

[0054] Step 9. If the maximum displacement of the test point map is within the simulated maximum displacement range of the sector where the test object is located, and no interference occurs, the theoretical width and the theoretical height are respectively taken as the product width and the product height, and step 10 is executed; otherwise, the theoretical width and the theoretical height are corrected according to the maximum displacement of the test point map and the interference, and the new hoop 7 is re-made, and step 7 is executed.

[0055] Step 10. According to the product width and the product height, a new hoop 7 is made, and the original hoop 3 is replaced one by one with the new hoop 7 to improve the interference problem between the original hoop 3 and the 2# end shaft 5, and to ensure the observation accuracy and stability of the telescope.

[0056] In one embodiment, as shown in Figure 4 , the new hoop 7 includes a hoop body 8, the top of the tray steel plate 9 of the hoop body 8 is provided with an expanded steel plate 10, the width of the expanded steel plate 10 is greater than the width of the tray steel plate 9, the top of the expanded steel plate 10 is provided with a stainless steel plate 11, the top of the stainless steel plate 11 is provided with a gantry structure 26, the width of the expanded steel plate 10 is 400mm, the height is 300mm, that is, the width of the stainless steel plate 11 is 400mm, the height is 300mm, the width of the gantry structure 26 is 350mm, and the height of the gantry structure 26 is 260mm.

[0057] In one embodiment, as shown in Figure 5 , the gantry structure 26 includes L-shaped support rods 12 located on both sides of the stainless steel plate 11, the upper ends of the two support rods 12 are connected with a horizontal rod 13, the two ends of the horizontal rod 13 are respectively provided with a vertical rod 14, and the two ends of the vertical rod 14 are connected with a viewing mirror 15, the width between the two support rods 12 is 350mm, and the height of the horizontal rod 13 is 260mm. By adding the viewing mirror 15 on the gantry, the operator can directly observe whether the 2# end shaft 5 is interfered and damaged on the ring beam 1 during the inspection.

[0058] The tray steel plate 9 is welded with the expansion steel plate 10, the lower end of the support rod 12 is provided with the first threaded section 16, the first threaded section 16 is sequentially penetrated through the stainless steel plate 11 and the expansion steel plate 10 downwards and is locked through the double nuts 17, the first threaded section 16 below the double nuts 17 is provided with the split pin 18, the upper end of the support rod 12 is provided with the second threaded section 19, the two ends of the cross rod 13 are respectively provided with the threaded holes 20 matched with the second threaded section 19, the second threaded section 19 is provided with the jam nut 21, the vertical rod 14 is provided with the first nut 22, the two sides of the observation mirror 15 are respectively provided with the second nuts 23, the first nut 22 and the second nuts 23 are connected through the first bolt 24, the stainless steel plate 11 and the expansion steel plate 10 are connected through the second bolt 25. After the first bolt 24 is loosened, the angle of the observation mirror 15 can be conveniently adjusted, and after adjustment, the first bolt 24 can be tightened.

[0059] Further, the surface of the stainless steel plate 11 is provided with the rectangular coordinate system scale line 27, and the origin of the rectangular coordinate system scale line 27 is located at the center of the stainless steel plate 11.

[0060] When the original hoop 3 is replaced by the new hoop 7, the water stains and oil stains on the pipe wall of the ring beam 1 at the hoop installation position are wiped clean to avoid the friction between the hoop and the pipe wall of the ring beam due to wet and slippery reasons, and the fastening force is reduced.

[0061] When the original hoop 3 is replaced by the new hoop 7, the position and angle of the new hoop 7 on the lower chord pipe of the ring beam 1 are adjusted according to the backrest position of the quadrilateral reflecting surface unit 2, so that the two 2# end shafts 5 are respectively located at the center of the supporting plate of the new hoop 7, that is, the center of the stainless steel plate 11, when the reflecting surface is at the reference spherical surface, so as to reduce the interference and damage caused by the excessive displacement of the 2# end shaft 5.

[0062] The observation mirror 15 of the new hoop 7 is adjusted to a suitable inclination angle, so that the maintenance personnel on the horse path of the ring beam 1 can observe the overall situation of the movement of the 2# end shaft 5.

[0063] The above is only the preferred embodiment of the present application, it should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which will not affect the effect of the present application and the practicability of the patent.

Claims

1. A field replacement test method for a reflective surface and ring beam connection device, characterized in that, Includes the following steps: Step 1. Select two quadrilateral reflective surface units (2) that are relatively severely damaged and symmetrically positioned as test objects; Step 2. Simulate the working conditions of multiple large zenith angle parabolic surfaces, calculate the displacement of the 2# end shaft (5) of all quadrilateral reflective surface units (2) in the sector where the test object is located under different parabolic surfaces, and preliminarily determine the theoretical width and theoretical height of the gantry (4) of the test object; Step 3. Construct a gantry structure (26) based on the theoretical width and theoretical height. Modify the original clamp (3) using the gantry structure (26) to obtain a new clamp (7). Replace the original clamp (3) of the test object with the new clamp (7). Step 4. Record the movement trajectory points of the #2 end shaft (5) of the test object during the test cycle and make a test point map; at the same time, record the interference between the #2 end shaft (5) of the test object and the new clamp (7); Step 5. If the maximum displacement of the test point map is within the simulation maximum displacement range of the sector where the test object is located, and no interference occurs, then the theoretical width and theoretical height meet the requirements, and proceed to step 6; otherwise, adjust the theoretical width and theoretical height according to the maximum displacement and interference of the test point map, and proceed to step 3. Step 6. Randomly select a quadrilateral reflective surface unit (2) as the test object; Step 7. Replace the original clamp (3) of the object to be inspected with the new clamp (7); Step 8. Record the movement trajectory points of the #2 end shaft (5) of the inspection object within the inspection cycle and make an inspection point map; at the same time, record the interference between the #2 end shaft (5) of the inspection object and the new clamp (7); Step 9. If the maximum displacement of the inspection point map is within the simulation maximum displacement range of the sector where the inspection object is located, and no interference occurs, then the theoretical width and theoretical height are respectively used as the product width and product height, and step 10 is executed; otherwise, the theoretical width and theoretical height are corrected according to the maximum displacement and interference of the inspection point map, and a new clamp (7) is remade, and step 7 is executed. Step 10. Make new clamps (7) according to the product width and product height, and replace the original clamps (3) one by one with the new clamps (7); The displacement of the 2# end shaft (5) includes displacement in three directions: the width direction of the gantry in the plane, the vertical direction of the gantry, and the tilting direction of the end shaft.

2. The on-site replacement test method for the reflective surface and ring beam connection device according to claim 1, characterized in that, The new clamp (7) includes a clamp body (8), and an extension steel plate (10) is provided on the top of the pallet steel plate (9) of the clamp body (8). The width of the extension steel plate (10) is greater than the width of the pallet steel plate (9). A stainless steel plate (11) is provided on the top of the extension steel plate (10). A gantry structure (26) is provided on the top of the stainless steel plate (11). The width of the extension steel plate (10) is 400mm and the height is 300mm. The width of the gantry structure (26) is 350mm and the height is 260mm.

3. The on-site replacement test method for the reflective surface and ring beam connection device according to claim 2, characterized in that, The gantry structure (26) includes L-shaped support rods (12) located on both sides of the stainless steel plate (11). The upper ends of the support rods (12) on both sides are connected to a crossbar (13). The two ends of the crossbar (13) are respectively provided with uprights (14). An observation mirror (15) is connected between the uprights (14) at both ends. The width between the support rods (12) on both sides is 350mm, and the height of the crossbar (13) is 260mm.

4. The on-site replacement test method for the reflective surface and ring beam connection device according to claim 3, characterized in that, The pallet steel plate (9) is welded to the extension steel plate (10). The lower end of the support rod (12) is provided with a first threaded section (16). The first threaded section (16) passes through the stainless steel plate (11) and the extension steel plate (10) in sequence and is locked by a double nut (17). The first threaded section (16) below the double nut (17) is provided with a cotter pin (18). The upper end of the support rod (12) is provided with a second threaded section (19). The two ends of the crossbar (13) are respectively provided with threaded holes (20) that are compatible with the second threaded section (19). The second threaded section (19) is provided with a tightening nut (21). The upright (14) is provided with a first nut (22). The two sides of the observation mirror (15) are respectively provided with second nuts (23). The first nut (22) and the second nut (23) are connected by a first bolt (24). The stainless steel plate (11) and the extension steel plate (10) are connected by a second bolt (25).

5. The on-site replacement test method for the reflective surface and ring beam connection device according to claim 2, characterized in that, The surface of the stainless steel plate (11) is provided with rectangular coordinate system scale lines (27), and the origin of the rectangular coordinate system scale lines (27) is located at the center of the stainless steel plate (11).

6. The on-site replacement test method for the reflective surface and ring beam connection device according to claim 1, characterized in that, The test period is 4 months, and the inspection period is 2 to 4 months.

7. The on-site replacement test method for the reflective surface and ring beam connection device according to claim 1, characterized in that, When replacing the original clamp (3) with the new clamp (7), wipe the water stains and oil stains off the pipe wall of the ring beam (1) at the clamp installation position.

8. The on-site replacement test method for the reflective surface and ring beam connection device according to claim 1, characterized in that, When the original clamp (3) is replaced with the new clamp (7), the position and angle of the new clamp (7) on the lower chord of the ring beam (1) are adjusted according to the position of the back frame of the quadrilateral reflector unit (2), so that the two #2 end shafts (5) are located at the center of the support plate of the new clamp (7) when the reflector is in the reference spherical surface.

9. The on-site replacement test method for the reflective surface and ring beam connection device according to claim 3, characterized in that, Adjust the observation mirror (15) of the new clamp (7) to a suitable tilt angle so that the maintenance personnel on the ring beam (1) can observe the full movement of the No. 2 end shaft (5).

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